Self-capacitance input device with hovering touch

ABSTRACT

A self-capacitance input device with hovering touch includes a sensing electrode layer, a reflection and deflection electrode layer, an insulation layer, and an amplifier with a gain greater than zero. The sensing electrode layer has a plurality of sensing electrodes on one side for sensing a touch or approach of an external object. The reflection and deflection electrode layer is disposed on the other side of the sensing electrode layer and has at least one reflection and deflection electrode. The insulation layer is disposed between the sensing electrode layer and the reflection and deflection electrode layer. The amplifier has an output coupled to the reflection and deflection electrode layer.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to the technical of touch panels and, moreparticularly, to a self-capacitance input device with hovering touch.

2. Description of Related Art

With rapid spread of smart phones and tablet computers that enablestouch input and multi finger gesture operation to be popular, therequirement of hovering gesture operations is then getting more and moreimportant. Hovering detectors are already used in various smart phonesto give an added value to the smart phones. The hovering detectors candetect approaching, leaving, position, and moving direction of an objectwithout having to come into touch with the object. However, the hoveringgesture detectors on the market mostly use optical photographic orinfrared scanning modes, which are likely to encounter the problems ofhand shadow, ambient light interference, and power consumption,resulting in disadvantage to the applications of a mobile device.

A projected capacitive touch control has the advantages of power saving,long lifetime, compact mechanism, and simple product design, and this isespecially suitable for the applications of mobile electronic devices.The capacitance detection scheme for the projected capacitive touchpanel can be divided into self-capacitance and mutual-capacitancesensing types. FIG. 1 is a typical self-capacitance sensing system, inwhich one conductor line is concurrently connected to the driving andsensing units 110, 120 in order to first drive the conductor line andthen sense the change of a signal on the conductor line therebydetermining the magnitude of self-capacitance.

Another method of driving the capacitive touch panel is to sense amagnitude change of mutual capacitance Cm so as to determine whetherthere is an object approaching to the touch panel. Similarly, instead ofbeing a physical capacitance, the mutual capacitance Cm is a capacitanceproduced between two conductors arranged in first and second directions.FIG. 2 is a schematic diagram of a typical mutual-capacitance sensingsystem. As shown in FIG. 2, the drivers 210 are disposed in the firstdirection (Y), and the sensors 220 are disposed in the second direction(X). At the upper half of a first period T1, the drivers 210 drive theconductor lines 230 in the first direction and use the voltage Vy_1 tocharge the mutual capacitance (Cm) 250, and at the lower half of thefirst period T1, all sensors 220 sense voltages (Vo_1, Vo_2, . . . ,Vo_n) on the conductor lines 240 in the second direction so as to obtainn data. Accordingly, m×n data can be obtained after m driving periods.

However, the prior projected capacitive touch panel is provided toachieve only the multi-touch detection, while being unable to performhovering touch. Therefore, it is desirable to provide an improved inputdevice with hovering touch to mitigate and/or obviate the aforementionedproblems.

SUMMARY OF THE INVENTION

The object of the present invention is to provide a self-capacitanceinput device with hovering touch, which can realize the hoveringdetection technology in a projected capacitive touch input device.

In one aspect of the present invention, there is provided aself-capacitance input device with hovering touch, which comprises: asensing electrode layer having a plurality of sensing electrodes on oneside for sensing a touch or approach of an external object; a reflectionand deflection electrode layer disposed on the other side of the sensingelectrode layer and having at least one reflection and deflectionelectrode; an insulation layer disposed between the sensing electrodelayer and the reflection and deflection electrode layer; and at leastone amplifier with a gain greater than zero having an output coupled tothe reflection and deflection electrode layer.

In another aspect of the present invention, there is provided aself-capacitance input device with hovering touch, which comprises: asensing/deflection electrode layer having a plurality ofsensing/deflection electrodes; a sensing control circuit having a touchsensing signal source; and a plurality of selection switch circuitscorresponding to the plurality of sensing/deflection electrodes,respectively, for sending a touch sensing signal generated by the touchsensing signal source to the corresponding sensing/deflection electrodesselected sequentially, wherein the touch sensing signal of the selectedsensing/deflection electrode is coupled to the sensing/deflectionelectrodes neighboring the selected sensing/deflection electrode throughthe at least one amplifier and the selection switch circuits therebyperforming a touch sensing or hovering detection.

In still another aspect of the present invention, there is provided aself-capacitance input device with hovering touch, which comprises: asensing/deflection electrode layer having a plurality of electrodes; aplurality of amplifiers each with a positive gain, wherein the gain ofeach amplifier is adjustable by programming; a sensing control circuithaving a touch sensing signal source; and a plurality of selectionswitch circuits corresponding to the plurality of electrodes,respectively, for sending a touch sensing signal generated by the touchsensing signal source to the corresponding electrodes selectedsequentially, wherein the touch sensing signal of the selected electrodeis coupled to the electrodes surrounding the selected electrode throughthe amplifiers and selection switch circuits for performing a touchsensing or hovering detection.

Other objects, advantages, and novel features of the invention willbecome more apparent from the following detailed description when takenin conjunction with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram of a typical self-capacitance sensingsystem;

FIG. 2 is a schematic, diagram of a typical mutual-capacitance sensingsystem;

FIG. 3A is a schematic diagram of a self-capacitance input device withhovering touch according to an embodiment of the present invention;

FIG. 3B schematically illustrates the position relation for a reflectionand deflection layer and a sensing electrode layer of theself-capacitance input device with hovering touch according to thepresent invention;

FIGS. 4A to 4D, 5A to 5C, and 6 schematically illustrate the operationprinciple of the self-capacitance input device with hovering touchaccording to the present invention;

FIG. 7 is a schematic diagram of a self-capacitance input device withhovering touch according to another embodiment of the present invention;

FIG. 8 is a schematic diagram of a self-capacitance input device withhovering touch according to still another embodiment of the presentinvention;

FIG. 9 is a schematic diagram of a self-capacitance input device withhovering touch according to yet another embodiment of the presentinvention; and

FIG. 10 is another schematic view illustrating that electric flux linesof the self-capacitance input device with hovering touch are deflectedand condensed in a specific direction according to the presentinvention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

FIG. 3A is a schematic diagram of a self-capacitance input device 300with hovering touch according to an embodiment of the present invention.The self-capacitance input device 300 includes a sensing electrode layer310, a reflection and deflection electrode layer 320, an insulationlayer 330, at least one amplifier 340 with a gain greater than zero, asensing control circuit 350, and a plurality of selection switchcircuits 360.

The sensing electrode layer 310 has a plurality of sensing electrodes311 on one side for sensing a touch or approach of an external object.Each of the sensing electrodes 311 has a shape of polygon, circle,triangle, rectangle, diamond, star, pentagon, hexagon, octagon, wedge,radiation, or square.

The reflection and deflection electrode layer 320 is disposed on theother side of the sensing electrode layer 310, and has at least onereflection and deflection electrode 321. The area of the at least onereflection and deflection electrode 321 is greater than or equal to anarea covered by the sensing electrodes 311. As shown in FIG. 3B, thereflection and deflection electrode layer 320 is disposed below thesensing electrode layer 310 and thus is indicated by a dotted line. Theplurality of sensing electrodes 311 and the at least one reflection anddeflection electrode 321 are made of conductive material selected fromthe group consisting of Cr, Ba, Al, Ag, Cu, Ti, Ni, Zn, Sn, Ta, Co, W,Mg, Ga, K, Li, In, Mo, alloy, ITO, IZO, ZnO, GZO, MG(OH)₂, conductivepolymer, carbon nanotube, graphene, silver nanowire, LiF, MgF₂, andLi₂O.

The insulation layer 330 is disposed between the sensing electrode layer310 and the reflection and deflection electrode layer 320.

The at least one amplifier 340 with a gain greater than zero has anoutput coupled to the reflection and deflection electrode 321 of thereflection and deflection electrode layer 320, The gain of the amplifier340 with a gain greater than zero is adjustable.

The sensing control circuit 350 has a touch sensing signal source 351for providing a sine wave, a triangle wave, a square wave or a trapezoidwave.

The plurality of selection switch circuits 360 are corresponding to theplurality of sensing electrodes 311, respectively. The plurality ofselection switch circuits 360 sequentially send a touch sensing signalgenerated by the touch sensing signal source 351 to the correspondingsensing electrodes 311 for performing a touch sensing or hoveringdetection.

With the selection switch circuits 360, the touch sensing signal is alsoapplied to the amplifier 340 with a gain greater than zero for beingamplified and subsequently sent to the reflection and deflectionelectrode layer 320. As shown in FIG. 3A, a selection switch circuit 360having one end connected to a symbol i represents that the end isconnected to a sensing electrode i.

FIGS. 4A to 4D, 5A to 5C, and 6 schematically illustrate the operationprinciple of the self-capacitance input device 30 with hovering touchaccording to the present invention. As shown in FIG. 4A, when there is atouch sensing signal on the sensing electrode S and there is no touchsensing signal on the sensing electrodes D1, D2, the electric flux linesare irradiated from the sensing electrode S to the sensing electrodesD1, D2. As shown in FIG. 4B, when the sensing electrode S is providedwith touch sensing signal, and sensing electrodes D1 and D2 are providedwith touch sensing signal having the same polarity as that on thesensing electrode S, due to the mutual repulsion principle between likecharges, the electric flux lines originated from the sensing electrode Sare extended farther due to the repulsion of the electric flux linesoriginated from the sensing electrodes D1, D2. As shown in FIG. 4C, whenthe sensing electrode S is provided with touch sensing signal and thesensing electrodes D1, D2 are provided with greater touch sensing signalthan that on the sensing electrode S, the electric flux lines areirradiated from the sensing electrodes D1, D2 to the sensing electrodeS. As shown in FIG. 4D, when the sensing electrode S is provided withtouch sensing signal, and the sensing electrodes D1, D2 are providedwith same-polarity and smaller touch sensing signal in comparison withthat on the sensing electrode S in which the touch sensing signal on thesensing electrode D1 is smaller than that on the sensing electrode D2,the electric flux lines originated from the sensing electrodes S, D1, D2are irradiated outward, and the electric flux lines are pushed by thetouch sensing signal of the sensing electrode D2 and thus deflectedtoward the sensing electrode D1, so that the electric flux linesoriginated from the sensing electrode S are deflected and extended overthe sensing electrode D1.

As shown in FIG. 5A, when there is a positive-polarity touch sensingsignal on the sensing electrode S and there is no touch sensing signalon the sensing electrodes D1, D2, it is equivalent to that the sensingelectrode S is provided with positive charge and the sensing electrodesD1, D2 are correspondingly provided with negative charge, so that theelectric flux lines are irradiated from the sensing electrode S to thesensing electrodes D1, D2. As shown in FIG. 5B, when there is apositive-polarity touch sensing signal on the sensing electrode S andthe reflection and deflection electrode R, and there is no touch sensingsignal on the sensing electrodes D1, D2, it is equivalent to that thesensing electrode S and the reflection and deflection electrode R areprovided with positive charge, and the sensing electrodes D1, D2 arecorrespondingly provided with negative charge, so that the electric fluxlines are irradiated from the sensing electrode S and the reflection anddeflection electrode R to the sensing electrodes D1, D2. At this moment,the electric flux lines irradiated from the sensing electrode S to thesensing electrodes D1, D2 are repulsed by the same-polarity electricalfield of the reflection and deflection electrode R, thereby beingupwardly irradiated out and pushed higher so as to enlarge the sensingrange. As shown in FIG. 5C, when there is positive-polarity touchsensing signal on the sensing electrode S, the reflection and deflectionelectrode R and the sensing electrodes D1, D2, it is equivalent to thatthe sensing electrode 5, the reflection and deflection electrode R andthe sensing electrodes D1, D2 are provided with positive charge, so thatthe electric flux lines originated from the sensing electrode S, thereflection and deflection electrode R and the sensing electrodes D1, D2are upwardly irradiated out. At this moment, the electric flux linesoriginated from the sensing electrode S are pushed due to the repulsionand thus are extended higher than those in FIG. 5B, so that the sensingrange becomes larger. Similarly, the same analysis can be applied withelectric flux lines in opposite direction when there isnegative-polarity touch sensing signal on the sensing electrode S, thereflection and deflection electrode R and the sensing electrodes D1, D2.

As shown in FIG. 6, the distances between the sensing electrode Sa andthe positions O1, O2 and O3 are equal, i.e., d1=d2=de. When an object isdisposed on the position O1, O2, or O3, the sensing signal sensed by thesensing electrode Sa is the same, so that the sensing, electrode Sacannot determine the position of the object. However, referring to FIG.4D, it is known that, when the sensing electrodes Sb, Sc neighboring thesensing electrode Sa are applied with touch sensing signals with thesame polarity but different magnitudes, electric flux lines aredeflected and distributed in different manners, and thus the position ofthe object can be determined based on the sensing signal of the sensingelectrode Sa.

Referring to FIG. 3A and FIG 5B, with the selection switch circuits 360,when the touch sensing signal is applied to the at least one amplifier340 with a gain greater than zero for being amplified and then sent tothe reflection and deflection electrode layer 320, the electric fluxlines on the sensing electrode e are pushed upwardly so as to enlargethe sensing range thereby allowing the hovering touch to be performed.

FIG. 7 is a schematic diagram of a self-capacitance input device 700with hovering touch according to another embodiment of the presentinvention. This embodiment is similar to that of FIG. 3A except that,with the selection switch circuits 360, the touch sensing signal isapplied to the at least one amplifier 340 with a gain greater than zerofor being amplified and subsequently sent to the sensing electrodes a,b, c, d, f, g, h, i neighboring the sensing electrode e. The operationprinciple is the same as that shown in FIG. 5C, in which the electricflux lines on the sensing electrode e are upwardly pushed again, so asto enlarge the sensing range for performing the hovering touch. In thisembodiment, the gain of the amplifier 340 with a gain greater than zerois preferably one.

FIG. 8 is a schematic diagram of a self-capacitance input device 800with hovering touch according to still another embodiment of the presentinvention. The self-capacitance input device 800 includes asensing/deflection electrode layer 810, at least one amplifier $20 witha gain greater than zero, a sensing control circuit 830, and a pluralityof selection switch circuits 840.

The sensing/deflection electrode layer 810 has a plurality ofsensing/deflection electrodes 811. The sensing control circuit 830 has atouch sensing signal source 831. The plurality of selection switchcircuits 840 are corresponding to the plurality of sensing/deflectionelectrodes 811, respectively. The plurality of selection switch circuits840 sequentially send a touch sensing signal generated by the touchsensing signal source 831 to the corresponding sensing/deflectionelectrodes 811 for performing a touch sensing or hovering detection.

This embodiment is similar to that of FIG. 7 except that the reflectionand deflection electrode layer 320 and the insulation 330 in FIG. 7 areremoved. As shown in FIG. 8 and FIG. 4B, with the selection switchcircuits 840, the touch sensing signal is applied to the at least oneamplifier 820 with a gain greater than zero for being amplified, andsubsequently sent to the sensing/deflection electrodes a, b, c, d, f, g,h, i neighboring a sensing/deflection electrode 840 under detection (thesensing/deflection electrode e). Therefore, the electric flux lines onthe sensing/deflection electrode e are upwardly pushed, so as to enlargethe sensing range for performing the hovering touch.

FIG. 9 is a schematic diagram of a self-capacitance input device 900with hovering touch according to yet another embodiment of the presentinvention. The self-capacitance input device 900 includes asensing/deflection electrode layer 910, a plurality of amplifiers 920each with a gain greater than zero, a sensing control circuit 930, aplurality of selection switch circuits 940, a reflection and deflectionelectrode layer 320, and an insulation layer 330.

The sensing/deflection electrode layer 910 has a plurality of electrodes911. The gain of each simplifier 920 with a gain greater than zero isadjustable by programming. The sensing control circuit. 930 has a touchsensing signal source 931. The plurality of selection switch circuits940 are corresponding to the plurality of electrodes 911, respectively.The plurality of selection switch circuits 940 sequentially send a touchsensing signal generated by the touch sensing signal source 931 to thecorresponding electrodes 911 for performing a touch sensing or hoveringdetection.

With the selection switch circuits 940, the touch sensing signal isapplied to the amplifiers 920 each with a gain greater than zero,respectively, for being amplified and subsequently sent to theelectrodes neighboring an electrode e under detection, such that theneighboring electrodes a, b, c, d, f, g, h, i, s01, s02, . . . , s16become the deflection electrodes for the electrode e.

Furthermore, the gains of the amplifiers 920 each with a gain greaterthan zero corresponding to the electrodes a, b, c, d, f, g, h, i, s01,s02, . . . , s16 are sequentially changed to enable the electric fluxlines above the electrode e to be deflected and condensed in a specificdirection, and sequentially read the sensing values of the electrode ecorresponding to the electrodes a, b, c, d, f, g, h, i, s01, s02, . . ., s16, so as to compare the sensing values for determining a relativeposition and direction of an approaching object in hovering.

As shown in FIG. 9, the connection between each of the plurality ofselection switch circuits 940 and the first to fifth connection linesL1, L2, . . . , L5 is the same as the connection between the selectionswitch circuit 940 corresponding to the electrode a and the first tofifth connection lines L1, L2, . . . L5. For keeping FIG. 9 to be clean,only the connection points for the electrodes corresponding to the otherselection switch circuits 940 to the first to fifth connection lines L1,L2, . . . , L5 are illustrated.

As shown in FIG. 9 and FIG. 4D, when the gain G1 of the amplifier 920-1is greater than the gain G2 of the amplifier 920-2 and the gain G2 isgreater than the gain G3 of the amplifier 920-3, the electric flux lineson the electrodes a, d, g, h, i connecting the second connection line L2are deflected toward the electrode c, so that the electrode c has ahigher density of the electric flux lines. FIG. 10 is another schematicview illustrating that the electric flux lines of the self-capacitanceinput device 900 with hovering touch are deflected and condensed in aspecific direction according to the present invention. As shown in FIG.10, the electrode a is connected to the fourth connection line L4, theelectrodes b, d are connected to the third connection line L3, and theelectrodes g, h, i, f, c are connected to the second connection line L2.When the gain G1 of the amplifier 920-1 is greater than the gain G2 ofthe amplifier 920-2 and the gain G2 is greater than the gain G3 of theamplifier 920-3, the electric flux lines on the electrodes g, h, i, f, care deflected toward the electrode a, so that the electrode a has ahigher density of the electric flux lines. Then, the gains of theplurality of amplifiers 920 each with a gain greater than zero and theplurality of selection switch circuits 940 are sequentially changed toenable the electric flux lines above the electrode e to be sequentiallydeflected and condensed in a specific direction, and the sensing valuesof the electrode e are sequentially read for comparison, therebydetermining a relative position and direction of an approaching objectin hovering.

In other embodiments, the reflection and deflection electrode layer 320and the insulation layer 330 of the self-capacitance input device 900can be eliminated, while the electric flux lines above the electrode estill can be deflected and condensed in a specific direction, therebydetermining a relative position and direction of an approaching objectin hovering.

In view of the foregoing, it is known that the present invention usesthe reflection and deflection electrode 321 of the reflection anddeflection electrode layer 320 to condense the electric flux lines of asensing electrode e in a detection direction and extend the electricflux lines far away along the direction so as to enlarge the sensingrange for performing the hovering touch, or increases charges of thesensing electrodes neighboring the sensing electrode e to furtherenlarge the sensing range for performing the hovering touch.Accordingly, the projected capacitive touch panel technology can beapplied for the hovering touch.

Although the present invention has been explained in relation to itspreferred embodiment, it is to be understood that many other possiblemodifications and variations can be made without departing from thespirit and scope of the invention as hereinafter claimed.

What is claimed is:
 1. A self-capacitance input device with hoveringtouch, comprising: a sensing electrode layer having a plurality ofsensing electrodes on one side for sensing a touch or approach of anexternal object; a reflection and deflection electrode layer disposed onthe other side of the sensing electrode layer and having at least onereflection and deflection electrode; an insulation layer disposedbetween the sensing electrode layer and the reflection and deflectionelectrode layer; and at least one amplifier with a gain greater thanzero having an output coupled to the reflection and deflection electrodelayer.
 2. The self-capacitance input device with hovering touch asclaimed in claim 1, wherein the at least one reflection and deflectionelectrode has an area greater than or equal to an area covered by theplurality of sensing electrodes.
 3. The self-capacitance input devicewith hovering touch as claimed in claim 2, further comprising: a sensingcontrol circuit having a touch sensing signal source; and a plurality ofselection switch circuits corresponding to the plurality of sensingelectrodes, respectively, for sequentially sending a touch sensingsignal generated by the touch sensing signal source to the correspondingsensing electrodes thereby performing a touch sensing or hoveringdetection.
 4. The self-capacitance input device with hovering touch asclaimed in claim 3, wherein, with the plurality of selection switchcircuits, the touch sensing signal is applied to the at least oneamplifier for being amplified and subsequently sent to the reflectionand deflection electrode of the reflection and deflection electrodelayer.
 5. The self-capacitance input device with hovering touch asclaimed in claim 4, wherein, with the plurality of selection switchcircuits, the touch sensing signal is applied to the at least oneamplifier for being amplified and subsequently sent to the sensingelectrodes neighboring a sensing electrode under detection.
 6. Theself-capacitance input device with hovering touch as claimed in claim 5,wherein each of the sensing electrodes has a shape of a polygon, circle,triangle, rectangle, diamond, star, pentagon, hexagon, octagon, wedge,radiation, or square.
 7. The self-capacitance input device with hoveringtouch as claimed in claim 6, wherein the plurality of sensing electrodesand the at least one reflection and deflection electrode are made ofconductive material.
 8. The self-capacitance input device with hoveringtouch as claimed in claim 7, wherein the conductive material is selectedfrom the group consisting of Cr, Ba, Al, Ag, Cu, Ti, Ni, Zn, Sn, Ta, Co,W, Ca, K, Li, In, Mo, alloy, ITO, IZO, ZnO, GZO, MG(OH)₂, conductivepolymer, carbon nanotube, graphene, silver nanowire, LiF, MgF₂, andLi₂O.
 9. The self-capacitance input device with hovering touch asclaimed in claim 1, wherein the gain of the at least one amplifier isadjustable.
 10. A self-capacitance input device with hovering touch,comprising: a sensing/deflection electrode layer having a plurality ofsensing/deflection electrodes; a sensing control circuit having a touchsensing signal source; and a plurality of selection switch circuitscorresponding to the plurality of sensing/deflection electrodes,respectively, for sending a touch sensing signal generated by the touchsensing signal source to the corresponding sensing/deflection electrodesselected sequentially, wherein the touch sensing signal of the selectedsensing/deflection electrode is coupled to the sensing/deflectionelectrodes neighboring the selected sensing/deflection electrode throughthe at least one amplifier and the selection switch circuits therebyperforming a touch sensing or hovering detection.
 11. Theself-capacitance input device with hovering touch as claimed in claim10, wherein, with the plurality of selection switch circuits, the touchsensing signal is applied to the at least one amplifier for beingamplified and subsequently sent to the sensing/deflection electrodesneighboring the selected sensing/deflection electrode.
 12. Theself-capacitance input device with hovering touch as claimed in claim11, wherein each of the sensing/deflection electrodes has a shape ofpolygon, circle, triangle, rectangle, diamond, star, pentagon, hexagon,octagon, wedge, radiation, or square.
 13. The self-capacitance inputdevice with hovering touch as claimed in claim 12, wherein thesensing/deflection electrodes are made of conductive material.
 14. Theself-capacitance input device with hovering touch as claimed in claim13, wherein the conductive material is selected from the groupconsisting of Cr, Ba, Al, Ag, Cu, Ti, Ni, Zn, Sn, Ta, Co, W, Mg, Ca, K,Li, In, Mo, alloy, ITO, IZO, ZnO, GZO, MG(OH)₂, conductive polymer,carbon nanotube, graphene, silver nanowire, LiF, MgF₂, and Li₂O.
 15. Theself-capacitance input device with hovering touch as claimed in claim10, wherein the gain of the at least one amplifier is adjustable.
 16. Aself-capacitance input device with hovering touch, comprising: asensing/ deflection electrode layer having a plurality of electrodes; aplurality of amplifiers each with a positive gain, wherein the gain ofeach amplifier is adjustable by programming; a sensing control circuithaving a touch sensing signal source; and a plurality of selectionswitch circuits corresponding to the plurality of electrodes,respectively, for sending a touch sensing signal generated by the touchsensing signal source to the corresponding electrodes selectedsequentially, wherein the touch sensing signal of the selected electrodeis coupled to the electrodes surrounding the selected electrode throughthe amplifiers and selection switch circuits for performing a touchsensing or hovering detection.
 17. The self-capacitance input devicewith hovering touch as claimed in claim 16, wherein, with the selectionswitch circuits, the touch sensing signal is applied to the plurality ofamplifiers for being amplified and subsequently sent to the electrodesneighboring the selected electrode thereby making the neighboringelectrodes as deflection electrodes for the selected electrode.
 18. Theself-capacitance input device with hovering touch as claimed in claim17, wherein the gains of the amplifiers corresponding to the deflectionelectrodes are sequentially changed to enable electric flux lines abovethe selected electrode to be deflected and condensed in a specificdirection, and sensing values of the selected electrode are sequentiallyread for comparison, thereby determining a relative position anddirection of an approaching object in hovering.
 19. The self-capacitanceinput device with hovering touch as claimed in claim 18, wherein each ofthe electrodes has a shape of polygon, circle, triangle, rectangle,diamond, star, pentagon, hexagon, octagon, wedge, radiation, or square.20. The self-capacitance input device with hovering touch as claimed inclaim 19, wherein the electrodes are made of conductive material. 21.The self-capacitance input device with hovering touch as claimed inclaim 20, wherein the conductive material is selected from the groupconsisting of Cr, Ba, Al, Ag, Cu, Ti, Ni, Zn, Sn, Ta, Co, W, Mg, Ca, K,Li, Mo, alloy, ITO, IZO, ZnO, GZO, MG(OH)₂, conductive macromolecule,carbon nanotube, graphene, silver nanowire, LiF, MgF₂, and Li₂O.